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Table 1 Overview main variables over time from 2006 to 2014

From: Stroke units, certification, and outcomes in German hospitals: a longitudinal study of patient-based 30-day mortality for 2006–2014

  2006 2008 2010 2012 2013 2014
Number of hospital observationsa 1331 1292 1244 1228 1203 1162
Average 30-day stroke SMRb 1.12 1.09 1.06 1.05 1.02 0.99
Number of hospitals with SUc,d 276 337 439 414 423 436
Number of ospitals with certified SUd,e 162 189 177 211 220 222
Number of hospitals with THQ certificationd 383 434 398 360 334 280
Average stroke case volumef per hospital 167 188 202 215 219 227
Share stroke cases/inpatient cases (in %) 3.2 3.3 3.4 3.5 3.4 3.6
Numb. of hospitals with teaching status (%) 511 (38) 557 (43) 581 (47) 619 (50) 625 (52) 642 (55)
Average number of hospital beds 331 334 341 347 348 355
Average CMS specialization indexf 1.35 1.34 1.46 1.38 1.37 1.40
Number of orivate, for-profit hospitals (%) 225 (17) 237 (18) 245 (20) 257 (21) 255 (21) 255 (22)
Number of private, non-profit hospitals (%) 592 (44) 574 (44) 551 (44) 527 (43) 514 (43) 477 (41)
Number of public hospitals (%) 514 (39) 481 (37) 448 (36) 444 (36) 434 (36) 430 (37)
Number of hospitals with stroke diagnosesg 1332 1362 1329 1,37 1341 1344
  1. aall observations that have QSR SMR stroke outcome data
  2. bweighted by the AOK stroke patient volume for each hospital
  3. cbased on more than 10 documented complex stroke procedures (OPS codes 8_891 und 8_89b), for 2014 461 SU exist in full sample independent on whether QSR data is available
  4. dand have QSR SMR stroke outcome data (especially for THQ overall more certified hospitals in Germany)
  5. eDSG SU certification suspended in 2008 and part of 2009, which led to a backlog of (re-) certification applications and a reduction in DSG certified hospitals in data year 2010
  6. fbased on ICD stroke diagnoses I61 (hemorrhage), I63 (ischemic) and I64 (not further specified)
  7. gAll hospitals which have coded 2 or more stroke ICD cases. Discrepancy in number of observations due to QSR data availability and G-BA reporting for multiple sites starting in 2010 and becoming mandatory in 2012 and 2013